Reduce Facies Uncertainties Distrbution at Reservoir Scale: Insight from High-Resolution 4D Stratigraphical model

Abstract

SUMMARYReducing uncertainties at appraisal stage of a reservoir is a key challenge to tackle, due to the limited number of exploration wells. The prediction of the facies architecture inside complex reservoirs is another challenging task, that cannot be assessed using classical geostatistics methods.The facies are used as the main guideline to populate the properties of static model, reducing error in facies assignation and propagation in the mesh is mandatory. In such a composite context, a tool able to constrain physically and geologically the sediments spatial distribution is a serious advantage.In this framework, 4D Forward Stratigraphic Modeling can be a useful tool to assess facies distribution. For the last 15 years this tool has been applied, commonly to exploration studies, and is now applied to reservoir scale studies.4D Forward stratigraphic modelling is a powerful tool to populate with an inner logic a three dimension geological model. The rules of physics, sedimentology and stratigraphy are honored and allowed the building of predictive environment of deposition and lithologies. At fine scale, Forward Stratigraphic Models could be used as a new method suitable for representing geologically reservoir heterogeneities in the static reservoir modelling, during the very challenging well-poor appraisal phase